I agree. I put the EH's back in the Torii and true to the first time I had them in there I like them the best of all the EL34/6CA7 varieties that I have now tried. I really like the JJ's, thought the "Mullards" were pretty good, and wasn't crazy about the Black Treasures(although I think I had at least one that was defective). I'm going to leave them alone now and the only tube I may still play with is my inputs, where I'm currently using an Amperex 70's green globe 7308's that sound fabulous.

I think the CCE mod works for Pentode and the JJ and Shuguang Treasure are Pentode. The Psvane T series at Grant audio are listed as an upgrade of the Treasures, so are presumably pentode. The EH is "The Electo Harmonix 6CA7 is a tough big bottle tetrode design". From EH write up, and apparently works in the Torii but presumably not using the CCE mod. I could not find anything, pentode or not, at Grant (or anywhere else except that Tubeampdoctor lists the Psvane under power pentodes). An email to Grant Fidelity would likely yield a definitive answer.